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by RockyMcNuts 3943 days ago
in a nutshell, as hopefully others have explained better...

before

- yuan is undervalued relative to market-clearing price

- central banks sells yuan to prevent it from rising too quickly

- selling yuan, it acquires dollars in exchange

- it builds currency reserves, invests in Treasuries

now

- yuan is overvalued relative to market-clearing price

- central bank buys yuan to prevent it from falling too quickly

- buying yuan, it needs to offer dollars in exchange

- it sells Treasurys for dollars, sells off currency reserves